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Will I need to re-jet

Discussion in 'XJ Technical Chat' started by jgardner14, Sep 9, 2008.

  1. jgardner14

    jgardner14 New Member

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    Hello everyone. I just bought a 81 maxim 550 and I had a question about it. I want to get a K&N air filter for it, will I need to re-jet my carbs? If so will a Dynojet Jet Kit work. Thanks
     
    jgardner14, Sep 9, 2008
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  2. dinoracer

    dinoracer Member

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    If its just the replacement filter for the airbox, probably not. This is for the K&N that goes inside of the airbox not the individual pods. If you do have to go up in size it would only probably be one main jet. I believe that the K&N stock replacement filter does breath better but if you are still running the stock exhaust then I wouldnt worry about it. When in doubt do a plug check and if its white go up in size or two.. One more thing, the replacement jets that are in a dynojet kit are not the same size as a mikuni carb jet. A dynojet 112.5 will not have the same internal diameter as a Mikuni carb jet. Yup it gets confusing on jetting.

    Sean
     
    dinoracer, Sep 9, 2008
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  3. jgardner14

    jgardner14 New Member

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    Would it be better to go with individual pods?
     
    jgardner14, Sep 9, 2008
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  4. chadwickm

    chadwickm Member

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    Pods will require rejeting and some serious tuning. If you are simply needing a new filter and the bike is running without issue, I would simply change the filter in the stock airbox. K&N filters are VERY good and it will be the last one you ever buy.
     
    chadwickm, Sep 10, 2008
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  5. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    The closer to stock you keep it the less tuning headaches you will incur. I use the stock Yamaha filter in the stock airbox and it works fine too. It is a "perpetual" filter in that no replacement interval is specified, they expect you to clean it out periodically is all. A "stock configuration" K & N will work just fine, simply double-check your plugs to be sure you're not too lean. As Sean said, if you have the stock exhaust you should be fine.
     
    bigfitz52, Sep 10, 2008
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